Manual Calibration Function; Aeration Function; Changing The Type Of Gas - ECR International UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

9.9 Manual Calibration Function:

Manual Calibration phase starts at the end of the
Automatic Calibration.
The Display shows the boiler power and adjustment
of the CO2 value (parameter setting) during Manual
Calibration sequence.
The process begins at minimum power.
A. After Automatic Calibration sequence with
flashing together on the display, you can adjust
minimum power combustion by pressing
lower % CO , and
2
B. When minimum power combustion is in the
specified range, press
ignition power.
C. Press to adjust ignition power combustion.
Press to lower % CO
D. When ignition power combustion is in the specified
range, press and then
power.
E. Press to adjust maximum power combustion.
Press to lower % CO
F. When maximum power combustion is in the
specified range, press
Function. ESC is displayed on the screen.
IMPORTANT INFORMATION
A. If display shows fault E118 (low pressure in
hydraulic circuit) open filling tap on appliance and
restore correct pressure.
B. If gas recognition function is interrupted due
to fault (e.g.: E133 no gas) press
reset. Then press
6 seconds) to restart the function again.
If gas recognition function is interrupted due to
overheating, restart function by pressing and
holding down together for at least 6 seconds.
C. Combustion of this appliance is factory default for
operation to Natural gas.
D. Type is being established.
9.10 De-Aeration Function
Used to eliminate air inside the heating circuit when
boiler is installed or after maintenance when water is
drained from primary circuit.
1.
Press buttons
seconds. On appears on display for a few seconds,
followed by program row 312.
2.
The electronic board will activate pump on/off cycle
for 10 minutes. Function will automatically stop at
end of cycle.
3.
To manually exit this function, press
buttons together and hold for 6 seconds.
9 - START UP PROCEDURE
to raise % CO .
2
and then to reach
, and to raise % CO
2
to reach maximum
, and to raise % CO
2
to exit Manual Calibration
to
and (for at least
together and hold for 6
FIGURE 9-3 - Gas Inlet Tap - Pi
to
PI = Gas Supply Inlet Pressure Tap

9.11 Changing The Type Of Gas

If change of gas type is required after first installation:
.
• Change parameter P02. See section 9.6
2
Commissioning and section 9.15 Parameter
Settings.
• Check minimum gas pressure is suitable for selected gas:
Minimum gas pressure is determined with boiler operating
at high fire and any other appliances connected to same fuel
.
2
source operational as well (whole house load)
Gas A (NG) = 3.5" (8.7 mbar)
Gas E (LPG) = 8.0" (19.9 mbar)
• Place supplied label with indication of gas type
close
to the data plate of boiler replacing the original.
• Perform Automatic Calibration Function - Section 9.8.
• Manufacturer recommends verification of CO2
concentration on the flue.
52
PI
240013503 REV A, [03/15/2022]